Shank and bit punch



Aug. 5, 1924- J. DITSON ET AL SHANK AND BIT PUNCH a?" Trial Filed Jan.6. 1921 Patented Aug. 5, 1924.

o STATES 'JESSE DJQTSON AND ARTHUR E. PETERS, OF LITTLE'ION, COLORADO,ASSIGNORS TO INGERSOLL-RAND COMPANY, OF JERSEY CITY, NEW JERSEY, A.CORPORATION OF NEW JERSEY.

SHANK- BIT PUNCH.

Application filed January 6, 1921. Serial No. 435,477."

To all whom it may concern: Be it known that we, JESSE DrrsoN and ARTHURE. PETERS, citizens of the United States, residing at Littleton,Arapahoe County, State of Colorado, have invented certain new and usefulImprovements in Shank and Bit Punches, of which the following is aspecification.

This invention relates to machines for 1 punching hollow articles butmore particularly to a pinning out machine of that type adapted forpunching the shanks and bits of hollow drill Steels, in order to clearthe bore of the steel, especially during the process of sharpening andshanking.

One object of the present invention is to enable a punch to be hammeredinto the hollow article as a drill steel while at the same time thehammer cylinder is bodily fed forward automatically by fluid pressure.

Another object of the invention is to enable the hammer cylinder to beretracted or returned by fluid pressure after the arti- 2 cle has beenpunched, while at the same time permitting the hammer to operate so thatthe punch is driven out of-the article by the rearward impact of thepiston hammer in the hammer cylinder.

To these and other ends which will hereinafter appear, the invention isillustrated.

in the accompanying drawings, in which" Figure 1 is a longitudinalSectional ele-' vation of a machine vention, v

Flgure 2 1s aslmilar new with the movable elements in a differentposition, and

embodying the in- Figure 3 is a detail longitudinal sectional viewshowing the controlling valve in a different position for thereturnstroke. Referring to the drawings A represents any suitable baseor frame as for lnstance a portion of the frame of a drill sharpeningmachine, or a bracket adapted to be secured to the base of the drillsharpening machine, or a separate pedestal upon which the shank and bitpunch is adapted to be mounted in any suitable .manner as by means ofthe bolts B. The article to be punched, as for instance the hollow drillI steel C may be held between suitable clamps D in position to bepunched.

The punching machine, in accordance with this invention, comprises themain caslng E preferably provided with the cylindrlcal portlon F withinwhich the hammer cylinder G is adapted to be actuated back and forth byfluid under pressure. The hammer cylinder is provided, as shown,with'the plunger head H and is closed by the back head J. The maincylindrical cas-- 111g F may be closed at its rear end by means of thecap'K. A fluid actuated piston hammer L of any suitable type, is adaptedto reciprocate within the hammer cylinder .G and in this instance ananvil block 0, which carries the "punch P, is adapted to receive theimpact blows of the hammer. The punch P may be secured to the reducedend Q-of the anvilblock O in any suitable manner, as by means of the nutR and lock nut S, so that the punch may be removed as desired. Motivefluid is supplied to the machine through the hollow bore T ofthethrottle valve U having a controlling handle vV. This throttle valve isprovided with the admission port W cooperating with the supply passage Xin the casing F for admitting fluid behind the plunger head. H of (thehammer c linder, and is also provided with the a mission port Y leadingto the casing F in front of plunger head H.

With the throttle valve U in the position indicated in Figures 1 and 2,and the remaining arts as indicated in Figure 1,

,motive fluld is admitted behindth'e lunger the casing F throughthe-supply passages.

a in the hammer cylinder behind the piston ,hammer L to actuate thehammer for-' wardly. On the forward stroke of the piston hammer, thecylinder bore in front of the hammer is open to atmosphere throu h theexhaust passages b in the walls oft e hammer cylinder.

When the piston hammer has completed its'forward stroke as indicated inFigure 2, the rearward bore of the hammer cylinder is exhausted throu hthe passage 0 in the piston leadin to t e annular groove d in thepiston, w ich falls-opposite the orts leading. to the exhaust passagesb. ive air pressure from the supply passages 41:

ton and through the longitudinallpassage e in the piston to the forwardend of the piston for the return stroke. The hammer piston L continuesto reciprocate and drive the punch P into the drill steel 0 or otherarticle to be punched, as the hammer cylinder is bodily fed forward inthe casing F.

i In order to retract or return the hammer cylinder in the casing F andwithdraw the punch P from the steel, the valve U is turned to theposition indicated in Figure 3, in which case the admission port W inthe throttle valve is moved opposite the port through which fluid issupplied to the casing F for the operation of the hammer piston, and agroove f in the periphery of the throttle connects the passage X in thecasing F with an exhaust port 9, which exhausts the pressure from behindthe plunger head -I-I so that the line pressure on the rearwardly actingshoulder of the plunger H forces the hammer cylinder bodily rearward inthe casing F; During the return movements of the hammer cylinder, thepiston hammer L continues to operate and by striking against the backhead J of the hammer cylinder taps or hammers the punch P out of thedrill steel C.

We claim: Y

1. In a shank and bit punch, the combina tion with a drill steel clampof apin punch for opening the bore of a drill steel placed in the clamp,a stationary casing, a hammer cylinder having a plunger head andmovleforwardly and rearwardly in said casing by fluid pressure for advancingthe unch toward and withdrawing it away rom the clamp, a fluid actuatedpiston hammer in said cylinder for delivering repeated blows to thepunch when engaged in the bore of the drill steel, a passagewa throu hsaid cylinder into said casing orward y of said lunger head to conductmotive fluid into sai cylinder, and avalve for distributing motive fluidto the casing both behind and in front of said plunger head during themovement of the hammer cylinder in one direction whileconstantlysupplying motive fluid to actuate the piston hammer to cause it toautomatically deliver such repeated blows in rapid succession on boththe forward and rearward movements of the hammer cylinder.

2. In a shank and bit punch the combination with a drill steel clamp ofa-pin punch a for opening thebore of a drill steel placed in the clamp,a stationary casing closed at the rearward end, a hammer cylinder havinga plunger head movable forwardly and rearwardiy in said casing by fluidpressure for casing forward gaged in the bore of the drill'steel, a. pas

sageway throu h said cylinder into said of said plunger head to conductmotive ui'd into said cylinder, and

' a valve for distributing motive fluid to the casing both behind and infront of said plunger head during the movement of the ammer cylinder invone direction while constantly supplying motive fluid to actuate thepiston hammer to cause it to automatically deliver such repeated blowsin rapid succession on both the forward and rearward movements of thehammer cylinder.

3. In a shank and bit punch, the combination with a drill steel clam ofa pin punch for opening the bore of a drill steel placed in the clamp, acasing,a hammer cylinder having a plunger head, a fluid actuated pistonhammer in said cylinder for delivering repeated blows to the punch whenengaged in the bore of the drill steel, passageways leading to saidcasing rearwardly of said cylinderand through said casing to theinterior of said cylinder, a valve for connection to a source of motivefluid supply and having alternate positions whereby motive fluid may beintroduced simultaneously to both sides of said cylinder plunger headfor one position of said valve, and exhausted from the casing at oneside of said plunger headand admitted to the other side of said plungerhead in another position of said valve.

4. In a shank'and bit punch, the combina tion with a drill steel clampof a pin punch for opening the bore of a drill steel placed in theclamp, a casing closed at one end, a

cylinder within said casing having a plunassociated with all saidpassageways and having alternate operating positions in both of whichaccess is ad by motive fluid to the casing forwardly of said plungerhead and to said cylinder, and in only one of which access is had bymotive fluid to the casing rearwardly of said plunger head.

In testimony whereof we have signed this specification.

JESSE DITSON.

i; E. PETERS.

